docs: def signout(request, next_page=userena_settings.USERENA_REDIRECT_ON_SIGNOUT,
              template_name='userena/signout.html', *args, **kwargs):
      """
      Signs out the user and adds a success message ``You have been signed
      out.`` If next_page is defined you will be redirected to the URI. If
      not the template in template_name is used.
  
      :param next_page:
          A string which specifies the URI to redirect to.
  
      :param template_name:
          String defining the name of the template to use. Defaults to
          ``userena/signout.html``.
  
      """
      if request.user.is_authenticated() and userena_settings.USERENA_USE_MESSAGES: # pragma: no cover
          messages.success(request, _('You have been signed out.'), fail_silently=True)
      userena_signals.account_signout.send(sender=None, user=request.user)
      return Signout(request, next_page, template_name, *args, **kwargs)